Trouble-Shooting In Plastic Injection Molding Processes And Machinery

Plastic Injection Molding

As with any manufacturing procedure, the processes of plastic injection molding can at times require a vigilant analysis and trouble-shooting methodology to ensure efficiency of the operation and end product quality. This article will provide an overview of some of the core components of plastic injection molding processes and machinery and an approach for trouble shooting.

Efficiency throughout every phase of any plastic molding operation is fundamental to Quality Control and Quality Assurance. In order to effectively implement trouble-shooting methods for plastic injection molding machines, it is necessary to understand the full range of the processes, detailed criteria of those processes, the materials, and subsections and specifics of each. Though this is clearly a comprehensive topic, an abbreviated outline is being provided here for space considerations.

Trouble-shooting plastic injection molding processes ultimately comes down to an analysis of four major components: (1) Material; (2) Mold; (3) Molding Cycle; and (4) Machine Performance. Additionally, in the practical world of injection molding, any existing problems tend to narrow down to the following three classifications: (1) Pre-molding; (2) Molding, and; (3) Post-molding. An outline of plastic injection molding machines, materials, and processes – as it applies to trouble shooting – generally consists of the following:

  • Molding procedures (i.e., extrusion blow molding, injection blow molding, etc.)
  • Different machine types and systems
  • Molding and finishing processes
  • Clamp systems
  • Feed systems
  • Gate designs (i.e., fan gate, tab gate, diaphragm gate, gate size, etc.)
  • Plastic molding materials (i.e., the types of plastics; features and characteristics)
  • Die tolerances for plastic molding;
  • Control of processes;
  • Challenges that may exist for any of the systems and processes

A review of potential problems as those problems might occur must be thorough and accurate. Operators and engineers must understand that Quality Control measures need be in place for every phase of the process – including from the beginning with the ordering or raw materials for production to completion and shipping of the finished product.

The importance of Quality Control and Quality Assurance cannot be sufficiently stressed for manufacturing and/or production processes. In short, it must be understood and measures must be in place to oversee each and every aspect of the plastic injection molding process. Every single component must have safeguards to ensure product and process quality. Furthermore, within Quality Control – and as an aspect to Trouble Shooting – there should be a “contingency” part to the plan; that is, “if” and “then”. By example, if a problem was to occur with any part of the process, no matter how seemingly minute or insignificant at the time, then the following measures will be taken, even if only to further monitor the process as an assurance for quality.

Quality Control and the requirements for trouble-shooting are undoubtedly major requirements of plastics molding machines and plastic molding processes. For further detailed information and assistance regarding blow molding equipment, turn to Pet All Manufacturing Inc. Pet All Manufacturing is a leading global provider of equipment that includes injection blow molding machines, extrusion blow molding machines; reheat stretch blow molding machinery, and more. See the full range of products on the company’s website. The Canadian branch of Pet All Manufacturing Inc. can be contacted by calling 905-305-1797 or by email at

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